Retirement Plans and Post Retirement Benefits Level 3 Rollforward (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]
Fair value of plan assets, beginning of year balance		$ 268.0		$ 270.3
Fair value of plan assets, end of year balance		237.4		268.0
Multi-strategy Funds
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]
Fair value of plan assets, beginning of year balance	[1]	26.1
Fair value of plan assets, end of year balance	[1]	84.2		26.1
Significant Unobservable Inputs (Level 3)
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]
Fair value of plan assets, beginning of year balance		26.1		41.7
Total unrealized gains (losses)				0.8
Defined Benefit Plan, Redemptions		(13.0)		(16.5)
Fair value of plan assets, end of year balance		13.3		26.1
Defined Benefit Plan, Mangement Fees		0.2		0.1
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]
Fair value of plan assets, beginning of year balance		26.1	[1]	25.2
Total unrealized gains (losses)				0.8
Defined Benefit Plan, Redemptions		(13.0)		0.0
Fair value of plan assets, end of year balance	[1]	13.3		26.1
Defined Benefit Plan, Mangement Fees		0.2		0.1
Significant Unobservable Inputs (Level 3) | Real Estate
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]
Fair value of plan assets, beginning of year balance		0.0		16.5
Defined Benefit Plan, Redemptions		0.0		16.5
Fair value of plan assets, end of year balance		$ 0.0		$ 0.0

[1] The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.